From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: get subtree contents as string
Date: Wed, 26 Feb 2020 16:13:52 -0500
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Matt Price <moptop99@gmail.com> writes:

> I have the following convenience function that scans contents of a subtree
> and then sets a property, adds an overlay, and changes the TODO status:
> (defun org-lms-set-grade ()
>   "set grade property for all headings on basis of \"- Grade :: \" line
>   Use with caution."
>   (interactive)
>   (save-restriction
>     (org-narrow-to-subtree)
>       (save-excursion
>       (org-back-to-heading)
>       (while (re-search-forward ol-grade-regex nil t )
>         (org-set-property "GRADE" (or (match-string 2) 0))
>         (org-todo "READY"))))
>   (org-lms-overlay-headings)  )
>
> It works, but there's a short (<1sec) non-responsive period when it runs.
> I'm wondering if it has to do with ~org-narrow-to-subtree~, so I thought
> I'd just copy the contents of the subtree as a string and replace
> re-search-forward with string-match. However, I'm not finding a
> super-obvious way to copy the subtree as a string. Am I missing something?
> And am I likely to be right that that's the source of the delay (as I write
> this, I'mwondering if hte overlay drawing might be the real problem? The
> whole project this is part of (https://github.com/titaniumbones/org-lms)
> suffers from delays while the buffer redraws, so I'm keen to figure out
> Better Ways To Do Things.

If it's just a matter of getting the subtree text, you could use
buffer-substring with org-end-of-subtree to find the end of the string.
Does that do it?